Application Note, V1.2, Aug 2010 AN-EVAL3BR0665JF. 100W 18V SMPS Evaluation Board with CoolSET F3R ICE3BR0665JF. Power Management & Supply

Transcription

1 Application Note, V1.2, Aug 2010 AN-EVAL3BR0665JF 100W 18V SMPS Evaluation Board with CoolSET F3R ICE3BR0665JF Power Management & Supply N e v e r s t o p t h i n k i n g.

2 Edition Published by Infineon Technologies Asia Pacific, 168 Kallang Way, Singapore, Singapore Infineon Technologies AP All Rights Reserved. Attention please! The information herein is given to describe certain components and shall not be considered as a guarantee of characteristics. Terms of delivery and rights to technical change reserved. We hereby disclaim any and all warranties, including but not limited to warranties of non-infringement, regarding circuits, descriptions and charts stated herein. Information For further information on technology, delivery terms and conditions and prices please contact your nearest Infineon Technologies Office ( Warnings Due to technical requirements components may contain dangerous substances. For information on the types in question please contact your nearest Infineon Technologies Office. Infineon Technologies Components may only be used in life-support devices or systems with the express written approval of Infineon Technologies, if a failure of such components can reasonably be expected to cause the failure of that life-support device or system, or to affect the safety or effectiveness of that device or system. Life support devices or systems are intended to be implanted in the human body, or to support and/or maintain and sustain and/or protect human life. If they fail, it is reasonable to assume that the health of the user or other persons may be endangered.

3 100W 18V Demo board using ICE3BR0665JF on board Revision History: V1.2 Previous Version: V1.1 Page Subjects (major changes since last revision) 1, 5, 10 Change demo board name to EVAL3BR0665JF 100W 18V SMPS Evaluation Board with CoolSET F3R ICE3BR0665JF: License to Infineon Technologies Asia Pacific Pte Ltd AN-PS0020 Kyaw Zin Min Kok Siu Kam Eric We Listen to Your Comments Any information within this document that you feel is wrong, unclear or missing at all? Your feedback will help us to continuously improve the quality of this document. Please send your proposal (including a reference to this document) to: ap-lab.admin@infineon.com

4 100W 18V Demo board using ICE3BR0665JF on board Table of Contents Page 1 Abstract Evaluation Board List of Features Technical Specifications Circuit Diagram PCB Layout Component side component legend Solder side copper & component legend Circuit Description Introduction Line Input Start up Operation mode Soft start RCD clamper circuit Peak current control of primary current Output Stage Feedback and regulation Blanking Window for Load Jump Active Burst Mode Jitter mode Protection modes Component List Transformer Construction Test Results Efficiency Input Standby Power Line Regulation Load Regulation Max. Overload Output Power Conducted EMI Waveforms and Scope Plots Start up at Low and High AC Line Input Voltage and 100W load Drain to Source Voltage and Current during 100W load Operation Load Transient Response (Load jump from 10% to 100% Load) AC Output Ripple during 100W Active Burst Mode at 0.5W load Vcc overvoltage protection Auto Restart Over load protection Auto Restart Open loop protection Auto Restart Vcc under voltage protection/short opto-coupler Auto Restart External Auto restart enable Frequency Jittering References...27 Application Note

5 1 Abstract This document is an engineering report that describes a universal input power supply designed in an 18V 100W off line flyback converter that utilizes the IFX F3R CoolSET 1 ICE3BR0665JF. The application board is operated in discontinuous conduction mode (DCM) and running at 67 khz switching frequency. It has one output voltage with secondary side control regulation. It is especially suitable for AC/DC power supply such as LCD monitors, adapters for printers and notebook computers, DVD players and recorder, Blue-Ray DVD player and recorder, set-top boxes and industrial auxiliary power supplies. The ICE3BR0665JF is a current mode control PWM integrated with CoolMOS. With the 650V startup cell, active burst mode and BiCMOS technologies, the standby power can be <100mW at no load and V in = 265Vac. The frequency jitter mode and the soft gate drive can give a low EMI performance. The built-in 20ms blanking window and the extendable blanking time concept can prevent the IC from entering the auto restart mode due to over load protection unintentionally. The outstanding propagation delay compensation feature can allow a very precise current limit between low line and high line. The IC provides auto-restart protection mode for Vcc overvoltage, over temperature, over load, open loop, Vcc under-voltage, short opto-coupler. In case it needs customer defined protection, the external auto restart enable feature can fulfill the requirement. 2 Evaluation Board Figure 1 EVAL3BR0665JF This document contains the list of features, the power supply specification, schematic, bill of material and the transformer construction drawing. Typical operating characteristics and performance curves with scope waveforms are presented at the rear of the report. 1 CoolSET is a trade mark of Infineon which is a PWM control IC integrated with CoolMOS in one package. Application Note

6 3 List of Features 650V avalanche rugged CoolMOS with built-in Startup Cell Active Burst Mode for lowest Standby Power Fast load jump response in Active Burst Mode 67 khz internally fixed switching frequency Auto Restart Protection Mode for Over-load, Open Loop, Vcc Undervoltage, Over-temperature & Vcc Over-voltage Built-in Soft Start Built-in blanking window with extendable blanking time for short duration high current External auto-restart enable Max Duty Cycle 75% Overall tolerance of Current Limiting < ±5% Internal PWM Leading Edge Blanking BiCMOS technology provides wide VCC range Built-in Frequency jitter feature and soft driving for low EMI 4 Technical Specifications Input voltage 85VAC~265VAC Input frequency 50Hz, 60Hz Input Standby Power < no load; < 0.5W load Output voltage and current 18V +/- 2% Output current 5.56A Output power 100W Average Efficiency >85% at 115Vac & 230Vac Output ripple 100W load < 100mVp-p Application Note

7 5 Circuit Diagram L 85V - 265Vac N 4A F1 VAR1 S10K uF/275V C2 EMI 1 2 x 15mH, 2.3A 0.22uF/275V C1 *RT1 BR1 KBU6G + C3 270uF/400V R1 33k/2W D1 UF4005 R4 0.27R R3 0.56R C9 100pF IC3 3 BA ICE3BR0665JF C5 0.1uF 5 GND 6 FB 4 Vcc C4 10nF/1kV C6 22uF/35V IC1 SFH617A-3 18V/5.56A COM + 2 CS 1 DRAIN C8 1nF C7 0.1uF 100W 18V SMPS Demoboard with ICE3BR0665JF(V0.3) Eric Kok/ 13 Mar nF/250V,Y1 CY1 2.2nF C17 10R R11 D3 MBR20H150CT C uF/25V TR1 LP=130uH R2 10R D2 1N4148 R6 750R R7 1.1K R2a 100R Z1 22V IC2 TL431 C15 + C uF/25V 2200uF25V C11 10pF C12 68nF R5 130k *R8a L1 1.5uH + C uF/35V R9 62k 1% R10 0R R8 10k 1% Figure 2 100W 18V ICE3BR0665JF power supply Schematic Application Note

8 N.B.: In order to get the optimized performance of the CoolSET, the grounding of the PCB layout must be connected very carefully. From the circuit diagram above, it indicates that the grounding for the CoolSET can be split into several groups; signal ground, Vcc ground, Current sense resistor ground and EMI return ground. All the split grounds should be connected to the bulk capacitor ground separately. Signal ground includes all small signal grounds connecting to the CoolSET GND pin such as filter capacitor ground, C5, C7, C8 and opto-coupler ground. Vcc ground includes the Vcc capacitor ground, C6 and the auxiliary winding ground pin of the power transformer. Current Sense resistor ground includes current sense resistor R3 and R4. EMI return ground includes Y capacitor, CY1. Application Note

9 6 PCB Layout 6.1 Component side component legend Figure 3 Component side Component Legend View from Component Side 6.2 Solder side copper & component legend Figure 4 Solder side copper View from Component Side Application Note

10 7 Circuit Description 7.1 Introduction The EVAL3BR0665JF demo board is an off line flyback switch mode power supply (SMPS) using the ICE3BR0665JF integrated power IC from the Infineon CoolSET F3R family. The circuit, shown in Figure 2, details an 18V, 100W power supply that operates from an AC line input voltage range of 85Vac to 265Vac, suitable for applications requiring either an open frame supply or an enclosed adapter. 7.2 Line Input The AC input side comprises the input fuse F1 as over-current protection. The conducted EMI choke EMI1, X-capacitors C1 and C2 and Y-capacitor CY1 act as electromagnetic interference suppressors. A varistor VAR1 is added to absorb the line transient surge voltage while a NTC, RT1 is added to reduce the inrush surge current during start up. A rectified DC voltage (120V ~ 374V) is obtained through the bridge rectifier BR1 and the input bulk capacitor C Start up Since there is a built-in startup cell in the ICE3BR0665JF, there is no need for external start up resistor. The startup cell is connecting the drain pin of the IC. Once the voltage is built up at the Drain pin of the ICE3BR0665JF, the startup cell will charge up the Vcc capacitor C6 and C7. When the Vcc voltage exceeds the UVLO at 18V, the IC starts up. Then the Vcc voltage is bootstrapped by the auxiliary winding to sustain the operation. 7.4 Operation mode During operation, the Vcc pin is supplied via a separate transformer winding with associated rectification D2 and buffering and filtering capacitors C5 and C6. Resistor R2 is used for current limiting. In order not to exceed the maximum voltage at Vcc pin, external zener diode Z1 and resistor R2a is added to clamp the voltage. 7.5 Soft start The Soft-Start time is built-in 20ms. After the Vcc hits UVLO at 18V, it starts the soft-start phase. 7.6 RCD clamper circuit While turns off the CoolMOS, the clamper circuit R1, C4 and D1 absorbs the current caused by transformer leakage inductance once the voltage exceeds clamp capacitor voltage. Finally drain to source voltage of CoolMOS is lower than maximum break down voltage (V (BR)DSS = 650V 1 ) of CoolMOS. 7.7 Peak current control of primary current The CoolMOS drain source current is sensed via external shunt resistors R3 and R4 which determine the tolerance of the current limit control. Since ICE3BR0665JF is a current mode controller, it would have a cycle-by-cycle primary current and feedback voltage control which can make sure the maximum power of the converter is controlled in every switching cycle. Besides, propagation delay compensation is implemented to ensure the maximum input current/power can be controlled in an even tighter manner. The demo board shows app. +/-2% (refer to Figure 13). 1 V (BR)DSS = Tj = 110 C Application Note

11 7.8 Output Stage The power is coupled to the secondary side through an ultra fast recovery diode D3. The capacitor C10, C13 and C15 provide energy buffering and the cascading LC filter L1 and C14 is used to reduce the output voltage ripple. The capacitor C10, C13 and C15 are selected to have a low internal resistance (ESR) to minimize the output voltage ripple. 7.9 Feedback and regulation The output voltage is controlled by a TL431 reference control IC (IC2). This device incorporates the voltage reference as well as the error amplifier. Compensation network C11, C12, R5, R8, R8a, R9 and R10 constitutes the loop compensation circuit. This circuitry allows the feedback to be precisely matched to dynamically varying load conditions and provides stable control. The maximum current through the optocoupler diode and the voltage reference is set by using resistors R6 and R7. Opto-coupler IC2 is used to transmit the control signal to the Feedback input of the ICE3BR4765JF device. The selected opto-coupler should meet DIN VDE 884 requirements for a wider creepage distance Blanking Window for Load Jump In case of Load Jumps the Controller provides a Blanking Window before activating the Over Load Protection and entering the Auto Restart Mode. There are 2 modes for the blanking time setting; basic mode and the extendable mode. If there is no capacitor added to the BA pin, it would fall into the basic mode; i.e. the blanking time is set at 20ms. If a longer blanking time is required, a capacitor, C5 can be added to BA pin to extend it. The extended time can be achieved by an internal 13uA constant current at BA pin to charge C5 from 0.9V to 4.0V. Thus the overall blanking time is the addition of 20ms and the extended time. For example, C5 (external capacitor at BA pin) = 0.1uF, I BK (internal charging current) = 13uA Blanking time (total) = 20ms + C5 X (4-0.9)/I BK = 43.9ms Note: A filter capacitor (e.g. 68nF (min. value)) may be needed to add to the BA pin if the noises cannot be avoided to enter that pin in the physical PCB layout. Otherwise, some protection features may be mistriggered and the system may not be working properly Active Burst Mode At light load condition, the SMPS enters into Active Burst Mode. At this stage, the controller is always active but the V CC must be kept above the switch off threshold; i.e. V CCoff 10.5V. During active burst mode, the efficiency increases significantly and at the same time it supports low ripple on V OUT and fast response on load jump. When the voltage level at FB falls below 1.25V, the internal blanking timer starts to count. When it reaches the built-in 20ms blanking time, it will enter Active Burst Mode. The Blanking Window is generated to avoid sudden entering of Burst Mode due to load jump. During Active Burst Mode the current sense voltage limit is reduced from 1V to 0.25V so as to reduce the conduction losses and audible noise. All the internal circuits are switched off except the reference and bias voltages to reduce the total V CC current consumption to below 0.45mA. At burst mode, the FB voltage is changing like a saw-tooth between 3.0 and 3.6V. To leave Burst Mode, FB voltage must exceed 4.5V. It will reset the Active Burst Mode and turn the SMPS into Normal Operating Mode. The maximum current; i.e. current sense voltage limit resume to 1V, can then be provided to stabilize V OUT Jitter mode The ICE3BR0665JF has frequency jittering feature to reduce the EMI noise. The jitter frequency is internally set at 67 khz (+/-2.7 khz) and the jitter period is set at 4ms. Application Note

12 7.13 Protection modes Protection is one of the major factors to determine whether the system is safe and robust. Therefore, sufficient protection is a must. ICE3BR0665JF provides all the necessary protections to ensure the system is operating safely. The protections include Vcc over-voltage, over-temperature, over-load, open loop, Vcc under-voltage, short opto-coupler, etc. When those faults are found, the system will go into auto-restart which means the system will stop for a short period of time and re-start again. If the fault persists, the system will stop again. It is then until the fault is removed, the system resumes to normal operation. A list of protections and the failure conditions are showed in the below table. Protection function Failure condition Protection Mode Vcc Over-voltage 1. Vcc > 25.5V & last for 120µs or 2. Vcc > 20.5V & FB > 4.5V & during soft start period Auto Restart Over-temperature (controller junction) Over-load / Open loop Vcc Under-voltage / short Opto-coupler T J > 130 C V FB > 4.5V and V BA > 4.0V (Blanking time counted from charging V BA from 0.9V to 4.0V ) Vcc < 10.5V Auto Restart Auto Restart Auto Restart Auto-restart enable V BA < 0.33V Auto Restart Application Note

13 8 Component List Item Circuit code Part Type Quantity 1 BR1 KBU6G 6A 400V 1 2 C1 0.22µF, 275V 1 3 C2 0.33µF, 275V 1 4 C3 270µF, 400V 1 5 C4 10n, 1kV 1 6 C5 0.1µF, 63V 1 7 C6 22µF, 35V 1 8 C7 0.1µF, 63V 1 9 C8 1nF, 63V 1 10 C9 100pF, 1kV 1 11 C µF, 25V 1 12 C11 270pF, 63V 1 13 C12 220nF, 63V 1 14 C µF, 25V 1 15 C14 220µF, 35V 1 16 C µF, 25V 1 17 C17 2.2nF, 100V 1 18 CY1 2.2nF, 250V 1 19 D1 UF D2 UF D3 MBR20H150CT 1 22 EMI1 2X15mH, 2.3A 1 23 FUSE1 4A 250V 1 24 FB1 Ferrite Bead 1 25 IC1 SFH IC2 TL IC3 ICE3BR0665JF 1 28 J1 ~ J4 Jumper 4 29 L1 1.5µH 1 30 R1 33K, 2W 1 31 R2 0R 1 32 R2a 100R, 1/4W 1 33 R3 0.51R, 1%, 1W 1 34 R4 0.27R, 1%, 1W 1 35 R5 130K, 1/4W 1 36 R6 240R, 1/4W 1 37 R7 1k1, 1/4W 1 38 R8 560k, 1%, 1/4W 1 39 R8A 22k, 1%, 1/4W 1 40 R9 100k, 1%, 1/4W 1 41 R10 33k, 1%, 1/4W 1 42 R11 10R,1/4W 1 43 VAR1 S10K 275V 1 44 TR1 ER35L,BH1/N67, Lp=130µH 1 45 Z1 24V zener 1 Application Note

14 9 Transformer Construction Core and material: EER35L, BH1 or N67 Bobbin: ER35L (12 pin) Vertical Version Primary Inductance, L p = 130 uh+3%, measured between pin 5 and pin 6 (Gapped to Inductance) Transformer structure: Figure 5 Transformer structure and top view of transformer complete Wire size requirement: Start Stop No. of turns Wire size layer x AWG#27 ½ Primary 7,8 9, X AWG#25 Secondary X AWG#33 Auxiliary x AWG#27 ½ Primary Application Note

15 10 Test Results 10.1 Efficiency Active-Mode Efficiency versus AC Line Input Voltage Efficiency [ % ] AC Line Input Voltage [ Vac ] Full load Efficiency Average Efficiency(25%,50%,75% & 100%) Figure 6 Efficiency vs. AC Line Input Voltage Efficiency versus Output Power Efficiency [ % ] Output Power [ W ] Vin=115Vac Vin=230Vac Figure 7 Efficiency vs. Output 115Vac and 23OVac Application Note

16 10.2 Input Standby Power 100 Stanby no-load versus AC Line Input Voltage Input Power [ mw ] AC Line Input Voltage [ Vac ] Po = 0W Figure 8 Input Standby no load vs. AC Line Input Voltage (Equipment: Yokogawa WT210 power meter using integration mode) Standby Pow 0.5W load versus AC Line Input Voltage 1.10 Input Power [ W ] AC Line Input Voltage [ Vac ] Po=0.5W Figure 9 Input Standby 0.5W load versus AC Line Input Voltage (Equipment: Yokogawa WT210 power meter using integration mode) Application Note

17 Standby Power 0.5W & 0.3W load versus AC Line Input Voltage Efficiency [ % ] AC Line Input Voltage [ Vac ] Pout=0.5W Figure 10 Standby Power 0.5W load versus AC Line Input Voltage 10.3 Line Regulation Line Regulation : Output Full Load versus AC Line Input Voltage Output Voltage [ V ] AC Line Input Voltage [ Vac ] full load Figure 11 Line Regulation vs. AC Line Input Voltage Application Note

18 10.4 Load Regulation Load Regulation: Vout versus Outoput Power Ouput Voltage [ V ] Output Power [ W ] Output 230Vac Output 115Vac Figure 12 Load Regulation vs. AC Line Input Voltage 10.5 Max. Overload Output Power Max. Overload Output & Input Power ( Peak Power ) versus AC Line Input Voltage Max. Overload Output Power [ W ] Pin=132.33±4.05% & Pout=111.06±1.29% AC Line Input Voltage [ V ] P o_max = V±1.8% Peak Output Power Peak Input Power Figure 13 Overload Output Power (Over Current Shut Off Threshold) vs. AC Line Input Voltage Application Note

19 10.6 Conducted EMI The conducted EMI was measured by Schaffner (SMR4503) and followed the test standard of EN55022 class B. The demo board was set up at maximum load (100W) with input voltage of 115Vac and 230Vac EN_V_QP EN_V_AV QP Pre Pk Pre AV Pre dbµv f / MHz Figure 14 Max. Load (100W) with 115 Vac (Line) 70 EN_V_QP EN_V_AV QP Pre Pk Pre AV Pre dbµv f / MHz Figure 15 Max. Load (100W) with 230 Vac (Line) Application Note

20 11 Waveforms and Scope Plots All waveforms and scope plots were recorded with a LeCroy 6050 oscilloscope 11.1 Start up at Low and High AC Line Input Voltage and 100W load Channel 1; C1 : Drain Source voltage (V DS ) Channel 2; C2 : Supply Voltage (V CC ) Channel 3; C3 : Feedback voltage (V FB ) Channel 4; C4 : BA Voltage (V BA ) Startup time = 0.49s, Soft start time = 20ms Figure 16 Vin=85Vac & 100W load Channel 1; C1 : Drain Source voltage (V DS ) Channel 2; C2 : Supply Voltage (V CC ) Channel 3; C3 : Feedback voltage (V FB ) Channel 4; C4 : BA Voltage (V BA ) Startup time = 0.48s, Soft start time = 20ms Figure 17 Vin=265Vac & 100W load 11.2 Drain to Source Voltage and Current during 100W load Operation Channel 1; C1 : Drain Source Voltage (V DS ) Channel 2; C2 : Drain Source Current (I DS ) Duty cycle = 40.6% Duty cycle = 13% Figure 18 Vin = 85Vac & 100W load Channel 1; C1 : Drain Source Voltage (V DS ) Channel 2; C2 : Drain Source Current (I DS ) Figure 19 Vin = 265Vac & 100W load Application Note

21 11.3 Load Transient Response (Load jump from 10% to 100% Load) Channel 1; C1 : Output Ripple Voltage (Vo) Channel 2; C2 : Output Current (Io) Current step slew rate = 0.4A/us Figure 20 Load Vin=85Vac from 10W to 100W load Channel 1; C1 : Output Ripple Voltage (Vo) Channel 2; C2 : Output Current (Io) Current step slew rate = 0.4A/us Figure 21 Load Vin=265Vac from 10W to 100W load 11.4 AC Output Ripple during 100W Channel 2; C2 : Output Ripple Voltage (Vo_ripple) Vo_ripple_pk to pk = 100mV Probe Terminal end with decoupling capacitor of 0.1uF(ceramic) & 10uF(Electrolytic), 20MHz filter Figure 22 AC output Vin=85Vac and 100W load Channel 2; C2 : Output Ripple Voltage (Vo_ripple) Vo_ripple_pk to pk = 100mV Probe Terminal end with decoupling capacitor of 0.1uF(ceramic) & 10uF(Electrolytic), 20MHz filter Figure 23 AC output Vin=265Vac and 100W load Application Note

22 11.5 Active Burst Mode at 0.5W load Channel 1; C1 : Drain Source voltage (V DS ) Channel 2; C2 : Current Sense Voltage (V CS ) Channel 3; C3 : Feedback voltage (V FB ) Channel 4; C4 : BA Voltage (V BA ) Blanking time to enter burst mode : appr.20ms Figure 24 Active burst Vin=85Vac and step from 5.56A to 0.03A Channel 1; C1 : Drain Source voltage (V DS ) Channel 2; C2 : Current Sense Voltage (V CS ) Channel 3; C3 : Feedback voltage (V FB ) Channel 4; C4 : BA Voltage (V BA ) Blanking time to enter burst mode : appr.20ms Figure 25 Active burst Vin=265Vac and step from 5.56A to 0.03A Channel 2; C2 : Output Voltage (Vo) Vo_ripple_pk to pk = 50mV Probe Terminal end with decoupling capacitor of 0.1uF(ceramic) & 10uF(Electrolytic), 20MHz filter Figure 26 Output ripple at active burst Vin=85Vac and 0.5W load Channel 2; C2 : Output Voltage (Vo) Vo_ripple_pk to pk = 50mV Probe Terminal end with decoupling capacitor of 0.1uF(Ceramic) & 10uF(Electrolytic), 20MHz filter Figure 27 Output ripple at active burst Vin=265Vac and 0.5W load Application Note

23 11.6 Vcc overvoltage protection Auto Restart Channel 1; C1 : Drain Source voltage (VDS) Channel 2; C2 : Supply voltage (VCC) Channel 3; C3 : Feedback Voltage (VFB) Channel 4; C4 : BA voltage (VBA) System enters auto restart mode when V CC >20.5V & V FB >4.5V during soft start period Figure 28 Vcc overvoltage Vin=85Vac; R9 disconnected before system start up with no load Channel 1; C1 : Drain Source voltage (VDS) Channel 2; C2 : Supply voltage (VCC) Channel 3; C3 : Feedback Voltage (VFB) Channel 4; C4 : BA voltage (VBA) System enters auto restart mode when V CC >20.5V & V FB >4V during soft start period Figure 29 Vcc overvoltage Vin=265Vac; R9 disconnected before system start up with no load Channel 1; C1 : Drain Source voltage (VDS) Channel 2; C2 : Supply voltage (VCC) Channel 3; C3 : Feedback Voltage (VFB) Channel 4; C4 : BA voltage (VBA) System enters auto restart mode when VCC>25.5V Figure 30 Vcc overvoltage Vin=85Vac; R9 disconnected after system start up with no load(delete Z1) Channel 1; C1 : Drain Source voltage (VDS) Channel 2; C2 : Supply voltage (VCC) Channel 3; C3 : Feedback Voltage (VFB) Channel 4; C4 : BA voltage (VBA) System enters auto restart mode when VCC>25.5V Figure 31 Vcc overvoltage Vin=265Vac; R9 disconnected after system start up with no load(delete Z1) Application Note

24 11.7 Over load protection Auto Restart Channel 1; C1 : Output Voltage (V O ) Channel 2; C2 : Output current (I O ) Channel 3; C3 : Feedback Voltage (VFB) Channel 4; C4 : BA voltage (VBA) System enters auto-restart when V FB >4.5V, V BA >4V with (built-in+extendable) blanking time (46ms). Figure 32 Over load protection with extended blanking Vin=85Vac; output power step up from 5.56A to 7A load(c5 = 0.1uF) Channel 1; C1 : Output Voltage (V O ) Channel 2; C2 : Output current (I O ) Channel 3; C3 : Feedback Voltage (VFB) Channel 4; C4 : BA voltage (VBA) System enters auto-restart when V FB >4.5V, V BA >4V with (built-in+extendable) blanking time (46ms). Figure 33 Over load protection with extended blanking Vin=265Vac; output power step up from 5.56A to 7A load(c5 = 0.1uF) 11.8 Open loop protection Auto Restart Channel 1; C1 : Drain Source voltage (V DS ) Channel 2; C2 : Supply Voltage (V CC ) Channel 3; C3 : Feedback voltage (V FB ) Channel 4; C4 : BA Voltage (V BA ) System enters auto-restart when V FB >4.5V, V BA >4V with (built-in+extendable) blanking time. Figure 34 Open loop protection with extended blanking Vin=85Vac; R9 disconnected during system operation at 100W load(c5=0.1µf) Channel 1; C1 : Drain Source voltage (V DS ) Channel 2; C2 : Supply Voltage (V CC ) Channel 3; C3 : Feedback voltage (V FB ) Channel 4; C4 : BA Voltage (V BA ) System enters auto-restart when V FB >4.5V, V BA >4V with (built-in+extendable) blanking time. Figure 35 Open loop protection with extended blanking Vin=265Vac; R9 disconnected during system operation at 100W load(c5=0.1µf) Application Note

25 11.9 Vcc under voltage protection/short opto-coupler Auto Restart Channel 1; C1 : Drain Source voltage (V DS ) Channel 2; C2 : Supply Voltage (V CC ) Channel 3; C3 : Feedback voltage (V FB ) Channel 4; C4 : BA Voltage (V BA ) System enters Auto Restart mode when V cc <10.5V Figure 36 Short opto-coupler Vin=85Vac; Short the transistor of opto-coupler during system operation. Channel 1; C1 : Drain Source voltage (V DS ) Channel 2; C2 : Supply Voltage (V CC ) Channel 3; C3 : Feedback voltage (V FB ) Channel 4; C4 : BA Voltage (V BA ) System enters Auto Restart mode when V cc <10.5V Figure 37 Short opto-coupler Vin=265Vac; Short the transistor of opto-coupler during system operation External Auto restart enable Channel 1; C1 : Drain Source voltage (V DS ) Channel 2; C2 : Supply Voltage (V CC ) Channel 3; C3 : Feedback voltage (V FB ) Channel 4; C4 : BA Voltage (V BA ) System enters auto restart mode when V ba <0.33V Figure 38 Auto restart enable by trigger BA Vin=85Vac; supply BA pin to 0.2V by function generator (C5=0.1uF) Channel 1; C1 : Drain Source voltage (V DS ) Channel 2; C2 : Supply Voltage (V CC ) Channel 3; C3 : Feedback voltage (V FB ) Channel 4; C4 : BA Voltage (V BA ) System enters auto restart mode when V ba <0.33V Figure 39 Auto restart enable by trigger BA Vin=265Vac; supply BA pin to 0.2V by function generator (C5=0.1uF) Application Note

26 11.11 Frequency Jittering Channel 1; C1 : Drain Source voltage (V DS ) Channel 1; C1 : Drain Source voltage (V DS ) Frequency changing from 63.1kHz ~ 67.1kHz, Jitter period is set at 4ms internally Frequency changing from 62.9kHz ~ 67.1kHz, Jitter period is set at 4ms internally Figure 40 Frequency change shown at Vin=85Vac and 100W Load Figure 41 Frequency change shown at VDS Vin=265Vac and 100W Application Note

27 12 References [1] Infineon Technologies, Datasheet CoolSET -F3R ICE3BR0665JF Off-Line SMPS Current Mode Controller with Integrated 650V CoolMOS and Startup Cell (Frequency Jitter Mode) in FullPak [2] Kok Siu Kam Eric, Kyaw Zin Min, Infineon Technologies, Application Note AN-PS0028, ICE3BRxx65JF CoolSET - F3R (Fullpak) new Jitter version Design Guide [3] Infineon Technologies, Application Note AN-SMPS-ICE2xXXX-1 CoolSET TM ICE2xXXX for OFF- Line Switch Mode Power Supply (SMPS) Application Note